Cast Channel by paying {G}{G}.
Activate Phyrexian Altar by sacrificing Honey Mammoth, adding {U}.
When Honey Mammoth dies, Fool's Demise's first and second abilities trigger.
Resolve the first Fool's Demise trigger, returning Honey Mammoth from your graveyard to the battlefield.
When Honey Mammoth enters the battlefield, it triggers, causing you to gain 4 life.
Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand.
Activate Channel four times by paying 4 life, adding {C}{C}{C}{C}.
Cast Fool's Demise by paying {4}{U}, attaching it to Honey Mammoth.
Repeat from step 2.

Infinite death triggers

Infinite ETB

Infinite lifegain triggers

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Fool's Demise

Channel

Phyrexian Altar

Honey Mammoth

Combos with "Honey Mammoth"